diff --git a/deps/v8/include/v8-version.h b/deps/v8/include/v8-version.h
index e135e011bc31af..089daa47f96ec0 100644
--- a/deps/v8/include/v8-version.h
+++ b/deps/v8/include/v8-version.h
@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 9
 #define V8_MINOR_VERSION 0
 #define V8_BUILD_NUMBER 257
-#define V8_PATCH_LEVEL 13
+#define V8_PATCH_LEVEL 16
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
diff --git a/deps/v8/src/compiler/js-call-reducer.cc b/deps/v8/src/compiler/js-call-reducer.cc
index 251ce6ee5a86b9..4bca26bbe0801a 100644
--- a/deps/v8/src/compiler/js-call-reducer.cc
+++ b/deps/v8/src/compiler/js-call-reducer.cc
@@ -4907,6 +4907,14 @@ Reduction JSCallReducer::ReduceStringPrototypeIndexOf(Node* node) {
       Node* position = n.Argument(1);
       new_position = effect = graph()->NewNode(
           simplified()->CheckSmi(p.feedback()), position, effect, control);
+
+      Node* receiver_length =
+          graph()->NewNode(simplified()->StringLength(), new_receiver);
+      new_position = graph()->NewNode(
+          simplified()->NumberMin(),
+          graph()->NewNode(simplified()->NumberMax(), new_position,
+                           jsgraph()->ZeroConstant()),
+          receiver_length);
     }
 
     NodeProperties::ReplaceEffectInput(node, effect);
diff --git a/deps/v8/src/debug/debug.cc b/deps/v8/src/debug/debug.cc
index c29fb9b7852abd..1e2e18170d52d8 100644
--- a/deps/v8/src/debug/debug.cc
+++ b/deps/v8/src/debug/debug.cc
@@ -1641,8 +1641,15 @@ Handle<Object> Debug::FindSharedFunctionInfoInScript(Handle<Script> script,
             UnoptimizedCompileFlags::ForScriptCompile(isolate_, *script);
         ParseInfo parse_info(isolate_, flags, &compile_state);
         IsCompiledScope is_compiled_scope;
-        Compiler::CompileToplevel(&parse_info, script, isolate_,
-                                  &is_compiled_scope);
+        const MaybeHandle<SharedFunctionInfo> maybe_result =
+            Compiler::CompileToplevel(&parse_info, script, isolate_,
+                                      &is_compiled_scope);
+        if (maybe_result.is_null()) {
+          if (isolate_->has_pending_exception()) {
+            isolate_->clear_pending_exception();
+          }
+          break;
+        }
         continue;
       }
       // We found it if it's already compiled.
diff --git a/deps/v8/src/wasm/baseline/ia32/liftoff-assembler-ia32.h b/deps/v8/src/wasm/baseline/ia32/liftoff-assembler-ia32.h
index ec52468a1a20b8..e0c27b25e81446 100644
--- a/deps/v8/src/wasm/baseline/ia32/liftoff-assembler-ia32.h
+++ b/deps/v8/src/wasm/baseline/ia32/liftoff-assembler-ia32.h
@@ -4027,13 +4027,8 @@ void LiftoffAssembler::emit_i64x2_mul(LiftoffRegister dst, LiftoffRegister lhs,
   Pmuludq(tmp2.fp(), tmp2.fp(), lhs.fp());
   Paddq(tmp2.fp(), tmp2.fp(), tmp1.fp());
   Psllq(tmp2.fp(), tmp2.fp(), 32);
-  if (CpuFeatures::IsSupported(AVX)) {
-    CpuFeatureScope scope(this, AVX);
-    vpmuludq(dst.fp(), lhs.fp(), rhs.fp());
-  } else {
-    if (dst.fp() != lhs.fp()) movaps(dst.fp(), lhs.fp());
-    pmuludq(dst.fp(), rhs.fp());
-  }
+  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmuludq, &Assembler::pmuludq>(
+      this, dst, lhs, rhs);
   Paddq(dst.fp(), dst.fp(), tmp2.fp());
 }
 
diff --git a/deps/v8/src/wasm/baseline/x64/liftoff-assembler-x64.h b/deps/v8/src/wasm/baseline/x64/liftoff-assembler-x64.h
index 92005bdb8f59db..d2c757ec08e9e2 100644
--- a/deps/v8/src/wasm/baseline/x64/liftoff-assembler-x64.h
+++ b/deps/v8/src/wasm/baseline/x64/liftoff-assembler-x64.h
@@ -3559,13 +3559,8 @@ void LiftoffAssembler::emit_i64x2_mul(LiftoffRegister dst, LiftoffRegister lhs,
   Pmuludq(tmp2.fp(), lhs.fp());
   Paddq(tmp2.fp(), tmp1.fp());
   Psllq(tmp2.fp(), 32);
-  if (CpuFeatures::IsSupported(AVX)) {
-    CpuFeatureScope scope(this, AVX);
-    vpmuludq(dst.fp(), lhs.fp(), rhs.fp());
-  } else {
-    if (dst.fp() != lhs.fp()) movaps(dst.fp(), lhs.fp());
-    pmuludq(dst.fp(), rhs.fp());
-  }
+  liftoff::EmitSimdCommutativeBinOp<&Assembler::vpmuludq, &Assembler::pmuludq>(
+      this, dst, lhs, rhs);
   Paddq(dst.fp(), tmp2.fp());
 }
 
diff --git a/deps/v8/test/mjsunit/regress/regress-1194869.js b/deps/v8/test/mjsunit/regress/regress-1194869.js
new file mode 100644
index 00000000000000..47b9975ddff906
--- /dev/null
+++ b/deps/v8/test/mjsunit/regress/regress-1194869.js
@@ -0,0 +1,25 @@
+// Copyright 2021 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Flags: --allow-natives-syntax --no-lazy-feedback-allocation
+// Flags: --interrupt-budget=100
+
+function f() {
+  return "".indexOf("", 2);
+}
+
+%PrepareFunctionForOptimization(f)
+assertEquals(f(), 0);
+assertEquals(f(), 0);
+%OptimizeFunctionOnNextCall(f)
+assertEquals(f(), 0);
+assertEquals(f(), 0);
+
+function g() {
+  return "".indexOf("", 2);
+}
+for (let i = 0; i < 191; i++) {
+  // Expect a natural optimization here due to low interrupt budget.
+  assertEquals(g(), 0);
+}